雙頻環形洩漏波及單一導體高階模洩漏波天線

Abstract

在本論文中，我們分別提出微帶線洩漏波第一高階模及單一導體洩漏波第二高階模兩種天線結構，一般的洩漏波天線具有高增益、高輻射效率、低成本等優點。 在微帶線洩漏波天線，我們利用槽孔耦合的方式來激發第一高階模，因為一般傳統微帶線洩漏波天線為了使波的能量充分洩漏完，所以需要用較長的天線長度來達成，為了縮小尺寸，我們將我們的天線折繞成環形來縮小尺寸，且又可得到跟未折繞前相同的效果。 單一導體洩漏波天線比微帶天線具有較寬的頻寬，在本論文中，我們使用共平面波導的饋入結構來激發第二高階模，由於單一導體的特性，使得它的天線場型朝向end fire的方向。

In this thesis, we propose two kinds of antenna structure: microstrip first higher order mode and single conductor second higher order mode. Generally, leaky wave antennas have the advantages: high gain, high radiation efficiency, low cost. In microstrip leaky wave antenna, we use aperture coupling with slot exciting first higher order mode. Because we want to leak the energy at our leaky wave antenna, we must use longer length at our antenna. For reducing the size, we let our antenna become ring, we can the same effect with original antenna. The single conductor leaky wave antenna has more bandwidth than the microstrip leaky wave antenna. In this thesis, we use coplanar waveguide(CPW) exciting second higher order mode, because of the characteristics in single conductor, the antenna pattern is end-fire.